[MERGE] Write status messages in push to stderr rather than stdout

[John Arbash Meinel]

John Arbash Meinel has voted approve.
Status is now: Approved


For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C1234226331.29642.38.camel%40ganieda.vernstok.nl%3E
Project: Bazaar